"The freedom to doubt
is an important matter in the sciences and, I believe, in other fields. It was born of a
struggle. It was a struggle to be permitted to doubt, to be unsure. And I do not want us
to forget the importance of the struggle and, by default, to let the thing fall away. I
feel a responsibility as a scientist who knows the great value of a satisfactory
philosophy of ignorance, and the progress made possible by such a philosophy, progress
which is the fruit of freedom of thought....If you know you are not sure, you have a
chance to improve the situation. I want to demand this freedom for future
generations."